Anime With Well Choreographed Fights?

Hey I'm looking for an Action/Adventure Anime with some really good fight sequences... I'd prefer more 'realistic' series but i wont complain if i get some recomendations for more fantasy based series as long as they have interesting fights.

Edit: I should probably add a list of Animes I've watched that fall in the lines of what i'm looking for

Claymore and Basilisk, perhaps? I'm not entirely sure, since this isn't my specialty, but I've heard that those two have good (if rather bloody) fights. Both are fantasy-based, though (monsters and ninjas, respectively).

Maybe History's Strongest Disciple Kenichi. They use actual martial arts, but it could be a little exaggerated.
Also, like the first half of the Tenjou Tenge anime, but ht emanga is much better of course.